A DC circuit switch replacement and remote debugging method

Abstract

The present invention relates to the field of electric power construction technology, and specifically to a method for replacing and remotely debugging a DC circuit switch. The method comprises: S1, moving the power switch terminal out of a vacant position; S2, installing an adapter terminal and connecting the power switch output terminal; S3, connecting the standby switch to the power supply and the power switch to supply power simultaneously; S4, performing individual debugging of the power switch in the DC panel; S5, debugging the power switch through a communication panel in a transformer substation or substation; S6, performing master-substation remote debugging of the power switch in a remote dispatching center; S7, replacing the power switch with the standby switch to supply power; S8, removing the power switch and installing a new power switch; S9, debugging the new power switch and replacing the standby switch with power; S10, removing the adapter terminal; S11, removing the standby switch. The DC circuit switch replacement and remote debugging can be completed without shutting down the operating transformer substation, and the DC system can always maintain uninterrupted power supply.

Description

Technical Field

[0001] The present invention relates to the technical field of electric power construction, and in particular to a method for replacing and remotely debugging a DC circuit switch. Background Art

[0002] The DC system of the substation provides power for relay protection. A power outage in the DC system will cause the high-voltage equipment in operation to trip without protection. If a line fault occurs, the accident will expand, burn out the equipment and cause the upper-level substation to trip. To ensure power supply safety, for substations that have been put into operation, the DC system is always in an uninterrupted power supply state. If the DC system stops operating, the high-voltage equipment of the substation will also stop operating.

[0003] For operational substations, the typical method for remote commissioning of DC circuit breakers is to verify the DC switch position signal while the substation is operating and remotely close and open the DC switches during a power outage. A substation outage can cause a power outage in the supply area, impacting production and daily life within the area.

[0004] Currently, there are three main methods for replacing DC circuit breakers:

[0005] 1. The substation is out of power continuously, the high-voltage equipment is out of operation, and all DC panels are replaced;

[0006] 2. The substation is out of power twice. During the first outage, the transition power panel is used to replace all the loads of the DC panel. After the DC circuit switch is replaced, the second outage is carried out to remove the transition panel and restore the normal power supply of the DC panel.

[0007] 3. The substation is operated with multiple intermittent power outages. During the short period when the high-voltage equipment is out of operation, a small number of DC circuit switches are replaced each time. After multiple replacements, all DC circuit switches are replaced.

[0008] All three methods mentioned above require a power outage in the entire institute, which will cause a power outage in the power supply area and affect production and life in the power supply area. Summary of the Invention

[0009] The present invention aims to solve the above-mentioned problems and thus provides a method for replacing and remotely debugging a DC circuit breaker. Compared with the prior art, the present invention has the following main advantages: DC circuit remote debugging can be completed without shutting down the operating substation, and the DC system can maintain uninterrupted power supply throughout the entire remote debugging process; at the same time, the transformation can be completed without shutting down the operating substation, and the DC system can maintain uninterrupted power supply.

[0010] The present invention solves the above problems by adopting the following technical solutions:

[0011] A method for replacing a DC circuit breaker and performing remote debugging comprises the following steps:

[0012] S1, move the power switch terminal out of the vacant position;

[0013] S2. Install the transfer terminal and connect it to the output terminal of the power switch;

[0014] S3, the standby switch is connected to the power supply and the power supply switch supplies power at the same time;

[0015] S4. Debug the power supply switch in the DC panel;

[0016] S5. Debug the power supply switch through the communication screen in the substation or transformer substation;

[0017] S6. Perform master-substation telecontrol debugging of the power supply switch at the remote dispatch center;

[0018] S7, the standby switch replaces the power switch to supply power;

[0019] S8. Remove the power switch and install a new one;

[0020] S9. Debug the new power switch and replace the standby switch for power supply;

[0021] S10, remove the transfer terminal;

[0022] S11. Remove the spare switch.

[0023] Furthermore, the moving of the power switch terminals out of the vacant spaces includes: before construction, sorting out the power switch feeder lines and their terminals that need to be modified according to the design drawings, DC panel wiring diagrams and actual conditions at the construction site; confirming the terminal numbers and the positive and negative pole wiring positions, and moving the two feeder line terminals of the power switch to the left, with the left terminal moved out by several terminal widths, and the right terminal moved out by several terminal widths, forming a spacing of several terminal spaces between the left and right terminals, and forming several terminal spaces to the right of the right terminal.

[0024] Furthermore, the installation of the adapter terminal and connecting the power supply switch output terminal includes: installing several adapter terminals in the empty space between the two power supply switch terminals, installing an adapter terminal in the empty space adjacent to the right terminal of the power supply switch, connecting the left terminal of the power supply switch and the adjacent right adapter terminal with a terminal connector, and connecting the right terminal of the power supply switch and the adjacent right adapter terminal with a terminal connector to form two power supply terminals, the two adapter terminals that constitute the power supply are respectively positively charged and negatively charged, and are separated by an uncharged adapter terminal in the middle.

[0025] Furthermore, the backup switch is connected to the power supply and the power supply switch to supply power at the same time, including: the upper end of the backup switch is connected to the DC panel power supply, and the lower end is connected to two energized adapter terminals respectively. When the backup switch is closed, the power supply switch circuit load is supplied by the backup switch and the power supply switch at the same time.

[0026] Furthermore, the single-unit debugging of the power supply switch in the DC panel includes: debugging the closing and opening of the power supply switch through the DC panel remote control module; and debugging the position and fault signal of the power supply switch through the DC panel switch quantity monitoring module.

[0027] Furthermore, the debugging of the power supply switch through the communication screen in the substation or transformer substation includes: the communication screen is switched from the remote dispatch control mode to the internal background control mode, the communication machine is restarted to update the AC and DC data, and the power supply switch is controlled to close and open through the communication screen industrial computer, and the power supply switch position and fault signal are checked.

[0028] Furthermore, the master-substation remote debugging of the power switch at the remote dispatching center includes: setting the communication screen to the remote dispatching control mode, controlling the closing and opening of the power switch through the remote dispatching center, and checking the power switch position and fault signal.

[0029] Furthermore, the backup switch replaces the power supply switch for power supply, including: the upper end of the backup switch is connected to a DC panel power supply, and the lower end is connected to two energized adapter terminals, closing the backup switch, separating the power supply switch, and the power supply switch circuit load is replaced by the backup switch.

[0030] Furthermore, the removing of the power switch and installing a new power switch includes: removing the feeder line and the power line of the power switch, removing the power switch, installing a new power switch, and wiring the new power switch.

[0031] Furthermore, the debugging of the new power supply switch and replacing the backup switch for power supply includes: manually opening and closing the new power supply switch, electrically controlling the opening and closing of the new power supply switch, debugging the position, fault and other signals of the new power supply switch, closing the new power supply switch to supply power, and opening the backup switch to exit.

[0032] Compared with the prior art, the present invention adopting the above technical solution has the following outstanding features:

[0033] The present invention is mainly used for remote debugging of DC circuit switches in operating substations and replacement of DC circuit switches in operating substations. It can also be used for replacement of DC circuit switches in other areas that rely on a DC system to ensure uninterrupted power supply. Compared with the existing technology, it has the following main advantages: DC circuit remote debugging can be completed without powering off the operating substation, and the DC system can always maintain uninterrupted power supply during the entire remote debugging process; at the same time, the transformation can be completed without powering off the operating substation, and the DC system can always maintain uninterrupted power supply. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] Figure 1 This is a schematic diagram of the terminal block before replacing the power switch according to an embodiment of the present invention;

[0035] Figure 2 Schematic diagram of a power switch terminal moved to the left out of an empty space according to an embodiment of the present invention;

[0036] Figure 3 This is a schematic diagram of installing a transfer terminal block in a vacant terminal block according to an embodiment of the present invention;

[0037] Figure 4 This is a wiring diagram of a transfer terminal block according to an embodiment of the present invention;

[0038] In the figure: 1. Terminal 1# of the power supply switch; 2. Terminal 2# of the power supply switch; A1. Positive power line from the power supply switch output; A3. Negative power line from the power supply switch output; A2. Connect the positive wire of the load; A4. Connect the negative wire of the load; C. Terminal block slot; B1. Terminal 1# of the transfer terminal block; B2. Terminal 2# of the transfer terminal block; B3. Terminal 3# of the transfer terminal block; LP. Terminal connecting piece; A5. Positive power line from the standby switch output; A7. Negative power line from the standby switch output. DETAILED DESCRIPTION

[0039] The following description of the embodiments will help the public better understand the present invention, but the specific embodiments given by the applicant cannot and should not be regarded as limitations on the technical solutions of the present invention. Any changes to the definitions of components or technical features and / or formal rather than substantive changes to the overall structure should be regarded as the scope of protection defined by the technical solutions of the present invention.

[0040] See also Figures 1 to 4 As shown, the technical solution of the present invention is as follows:

[0041] A method for replacing a DC circuit breaker and performing remote debugging comprises the following steps:

[0042] S1. Move the power switch terminals out of the vacant spaces: Before construction, sort out the power switch feeder lines and their terminals that need to be modified based on the design drawings, DC panel wiring diagram, and actual construction site conditions. Confirm the terminal numbers and positive and negative wiring positions. Shift the two feeder line terminals of the power switch to the left on the terminal block slot C, moving the left terminal three terminal widths away and the right terminal one terminal width away. This creates a gap of two terminal spaces between the left and right terminals, leaving one terminal space to the right of the right terminal.

[0043] S2. Install the transfer terminals and connect them to the power switch output terminals: Install two transfer terminals in the empty space between the two power switch terminals, and install one transfer terminal in the empty space to the right of the right terminal of the power switch. Connect the left terminal of the power switch to the adjacent right transfer terminal with a terminal connector LP, and connect the right terminal of the power switch to the adjacent right transfer terminal with a terminal connector LP to form two power supply terminals. The two transfer terminals that form the power supply are respectively charged with positive and negative electricity, and there is a non-charged transfer terminal in between.

[0044] S3. The standby switch is connected to the power supply and the power supply switch at the same time: the upper end of the standby switch is connected to the DC panel power supply, and the lower end is connected to two energized transfer terminals. When the standby switch is closed, the load of the power supply switch circuit is supplied by the standby switch and the power supply switch at the same time;

[0045] S4. Debug the power switch in the DC panel: debug the power switch on and off through the DC panel remote control module; debug the power switch position and fault signal through the DC panel switch quantity monitoring module;

[0046] S5. Debug the power switch via the communication screen in the substation or transformer substation: switch the communication screen from remote dispatch control mode to internal background control mode, restart the communication machine to update the AC and DC data, and control the power switch to close or open via the communication screen industrial computer, and check the power switch position and fault information;

[0047] S6. Perform master-substation remote debugging of the power switch at the remote dispatch center: Set the communication screen to remote dispatch control mode, and control the power switch closing and opening through the remote dispatch center, and check the power switch position and fault signal;

[0048] S7, repeat steps S1-S6 to perform remote debugging on the power switch;

[0049] S8. Complete the debugging of all power switches;

[0050] S9. The standby switch replaces the power switch for power supply: The upper end of the standby switch is connected to the DC panel power supply, and the lower end is connected to two energized transfer terminals. When the standby switch is closed, the power switch is disconnected, and the load of the power switch circuit is replaced by the standby switch;

[0051] S10. Remove the power switch and install a new one: Remove the feeder wires and power cords from the power switch, remove the power switch, install a new one, and wire the new one.

[0052] S11. Debug the new power supply switch and replace the standby switch for power supply: manually open and close the new power supply switch, electrically control the new power supply switch, debug the position of the new power supply switch, fault signals, etc., close the new power supply switch to supply power, and open the standby switch to exit;

[0053] S12. Remove the transfer terminals: Remove the wires connected to the standby switch from the transfer terminals, remove the terminal shorting connectors on the transfer terminals, and remove the three transfer terminals.

[0054] S13. Repeat steps S1, S2, S9, S10, S11, and S12 to replace other power switches.

[0055] S14. Remove the spare switch: After replacing all power switches, remove the connection between the spare switch and the transfer terminal, remove the spare switch power cord, and then remove the spare switch.

[0056] It should be noted that:

[0057] The power supply switch terminals include: power supply switch 1# terminal 1, power supply switch 2# terminal 2;

[0058] The transfer terminals include: transfer terminal block 1# terminal B1, transfer terminal block 2# terminal B2, transfer terminal block 3# terminal B3;

[0059] The power switch is equipped with: a positive power line A1 from the power switch output, a negative power line A3 from the power switch output, a positive wire A2 for connecting the load, and a negative wire A4 for connecting the load;

[0060] The standby switch is equipped with: a positive power line A5 from the standby switch output, and a negative power line A7 from the standby switch output;

[0061] The present invention is mainly used for remote debugging of DC circuit switches in operating substations and replacement of DC circuit switches in operating substations. It can also be used for replacement of DC circuit switches in other areas that rely on a DC system to ensure uninterrupted power supply. Compared with the existing technology, it has the following main advantages: DC circuit remote debugging can be completed without powering off the operating substation, and the DC system can always maintain uninterrupted power supply during the entire remote debugging process; at the same time, the transformation can be completed without powering off the operating substation, and the DC system can always maintain uninterrupted power supply.

[0062] The above description is only a preferred embodiment of the present invention and does not limit the scope of the present invention. Any equivalent changes made using the contents of the present invention specification and its drawings are included in the scope of the present invention.

Claims

1. A method for replacing and remotely debugging a DC circuit breaker, characterized by: The following steps are involved: S1, move the power switch terminal out of the vacant position; S2. Install the transfer terminal and connect it to the output terminal of the power switch; The step of installing the adapter terminals and connecting the power switch output terminals includes: installing a plurality of adapter terminals in a vacant space between two power switch terminals, installing a adapter terminal in a vacant space adjacent to the right terminal of the power switch, connecting the left terminal of the power switch and the adjacent right adapter terminal with a terminal connector, and connecting the right terminal of the power switch and the adjacent right adapter terminal with a terminal connector to form two power supply terminals, wherein the two adapter terminals forming the power supply are respectively charged with positive and negative electricity, and an uncharged adapter terminal is interposed between them; S3, the standby switch is connected to the power supply and the power supply switch supplies power at the same time; S4. Debug the power supply switch in the DC panel; S5. Debug the power supply switch through the communication screen in the substation or transformer substation; S6. Perform master-substation telecontrol debugging of the power supply switch at the remote dispatch center; S7, the standby switch replaces the power switch to supply power; The backup switch replaces the power supply switch for power supply, comprising: connecting the upper end of the backup switch to a DC panel power supply, and connecting the lower end to two energized transfer terminals, closing the backup switch and disconnecting the power supply switch, and replacing the power supply switch circuit load with the backup switch; S8. Remove the power switch and install a new one; S9. Debug the new power switch and replace the standby switch for power supply; S10, remove the transfer terminal; S11. Remove the spare switch.

2. The DC circuit switch replacement and remote debugging method according to claim 1 is characterized in that: The moving of the power switch terminals out of the vacant spaces includes: before construction, sorting out the power switch feeder lines and their terminals that need to be modified according to the design drawings, DC panel wiring diagrams and actual conditions at the construction site; confirming the terminal numbers and the positive and negative pole wiring positions, and moving the two feeder line terminals of the power switch to the left, moving the left terminal out of a position of several terminal widths, and moving the right terminal out of a position of several terminal widths, forming a spacing of several terminal vacancies between the left and right terminals, and forming several terminal vacancies to the right of the right terminal.

3. The DC circuit switch replacement and remote debugging method according to claim 1 is characterized in that: The standby switch is connected to the power supply and the power supply switch to supply power simultaneously, including: the upper end of the standby switch is connected to the DC panel power supply, and the lower end is connected to two energized transfer terminals respectively. When the standby switch is closed, the power supply switch circuit load is supplied by the standby switch and the power supply switch at the same time.

4. The DC circuit switch replacement and remote debugging method according to claim 1 is characterized in that: The single-unit debugging of the power supply switch in the DC panel includes: debugging the closing and opening of the power supply switch through the DC panel remote control module; and debugging the power supply switch position and fault signal through the DC panel switch quantity monitoring module.

5. The DC circuit breaker replacement and remote debugging method according to claim 1 is characterized in that: The debugging of the power supply switch through the communication screen in the substation or transformer substation includes: the communication screen is switched from the remote dispatch control mode to the internal background control mode, the communication machine is restarted to update the AC and DC data, and the power supply switch is controlled to be closed and opened through the communication screen industrial computer, and the power supply switch position and fault signal are checked.

6. The DC circuit breaker replacement and remote debugging method according to claim 1, characterized in that: The master-substation remote debugging of the power switch at the remote dispatching center includes: setting the communication screen to the remote dispatching control mode, controlling the power switch to close and open through the remote dispatching center, and checking the power switch position and fault signal.

7. The DC circuit switch replacement and remote debugging method according to claim 1, characterized in that: The removing of the power switch and installing of a new power switch includes: removing the feeder line and the power line of the power switch, removing the power switch, installing the new power switch, and wiring the new power switch.

8. The DC circuit switch replacement and remote debugging method according to claim 1, characterized in that: The debugging of the new power supply switch and replacing the backup switch for power supply includes: manually opening and closing the new power supply switch, electrically controlling the opening and closing of the new power supply switch, debugging the position and fault signal of the new power supply switch, closing the new power supply switch to supply power, and opening the backup switch to exit.

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